Effects of Excitatory and Inhibitory LIFUS of GPi in Parkinsonian Patients Without DBS

Low intensity focused ultrasound (LIFUS) is a novel non-invasive brain stimulation (NIBS) technique that permits stimulation with high spatial focality and can reach greater depth compared other methods. This study will look at the effects of two different LIFUS stimulations on task performance in patients with Parkinson\'s disease. The effects of real stimulation will also be compared to sham stimulation. The evaluations will include behavioral tasks on the computer, the Unified Parkinson\'s Disease Rating Scale (UPDRS) motor scoring, and finger accelerometry recordings. These will be done before the LIFUS simulations and repeated after. This is to evaluate the different mechanisms and efficacy of these stimulations on deep brain areas.